The document discusses key concepts related to e-marketing. It defines the Internet as the physical network that links computers globally, consisting of network servers and communication links. Wireless communications refer to electronic transactions using mobile devices. A browser is software used to locate and display web content. A domain name uniquely identifies a website. A URL is a reference to an Internet resource. A web server delivers web pages. Cookies store user information to personalize web pages. Clickstreams record user web interactions. Blogs are websites with chronological posts. E-marketing differs from traditional marketing in its lower costs, trackable results, global reach, and ability to personalize and engage customers 24/7 across multiple devices. E-commerce involves electronic exchanges